mirror of
https://github.com/gorhill/uBlock.git
synced 2024-11-11 17:41:03 +01:00
631 lines
18 KiB
JavaScript
631 lines
18 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2014-2017 Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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/* global punycode */
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/* jshint bitwise: false */
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'use strict';
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/******************************************************************************/
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µBlock.Firewall = (function() {
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/******************************************************************************/
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var magicId = 'chmdgxwtetgu';
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/******************************************************************************/
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var Matrix = function() {
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this.reset();
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};
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/******************************************************************************/
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var supportedDynamicTypes = {
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'3p': true,
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'image': true,
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'inline-script': true,
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'1p-script': true,
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'3p-script': true,
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'3p-frame': true
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};
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var typeBitOffsets = {
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'*': 0,
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'inline-script': 2,
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'1p-script': 4,
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'3p-script': 6,
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'3p-frame': 8,
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'image': 10,
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'3p': 12
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};
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var actionToNameMap = {
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'1': 'block',
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'2': 'allow',
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'3': 'noop'
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};
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var nameToActionMap = {
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'block': 1,
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'allow': 2,
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'noop': 3
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};
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/******************************************************************************/
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// For performance purpose, as simple tests as possible
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var reHostnameVeryCoarse = /[g-z_-]/;
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var reIPv4VeryCoarse = /\.\d+$/;
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var reBadHostname = /[^0-9a-z_.\[\]:-]/;
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// http://tools.ietf.org/html/rfc5952
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// 4.3: "MUST be represented in lowercase"
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// Also: http://en.wikipedia.org/wiki/IPv6_address#Literal_IPv6_addresses_in_network_resource_identifiers
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var isIPAddress = function(hostname) {
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if ( reHostnameVeryCoarse.test(hostname) ) {
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return false;
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}
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if ( reIPv4VeryCoarse.test(hostname) ) {
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return true;
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}
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return hostname.startsWith('[');
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};
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var toBroaderHostname = function(hostname) {
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var pos = hostname.indexOf('.');
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if ( pos !== -1 ) {
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return hostname.slice(pos + 1);
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}
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return hostname !== '*' && hostname !== '' ? '*' : '';
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};
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var toBroaderIPAddress = function(ipaddress) {
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return ipaddress !== '*' && ipaddress !== '' ? '*' : '';
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};
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var selectHostnameBroadener = function(hostname) {
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return isIPAddress(hostname) ? toBroaderIPAddress : toBroaderHostname;
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};
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/******************************************************************************/
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Matrix.prototype.reset = function() {
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this.r = 0;
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this.type = '';
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this.y = '';
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this.z = '';
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this.rules = {};
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};
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/******************************************************************************/
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Matrix.prototype.assign = function(other) {
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var thisRules = this.rules;
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var otherRules = other.rules;
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var k;
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// Remove rules not in other
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for ( k in thisRules ) {
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if ( thisRules.hasOwnProperty(k) === false ) {
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continue;
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}
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if ( otherRules.hasOwnProperty(k) === false ) {
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delete thisRules[k];
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}
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}
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// Add/change rules in other
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for ( k in otherRules ) {
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if ( otherRules.hasOwnProperty(k) === false ) {
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continue;
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}
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thisRules[k] = otherRules[k];
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}
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};
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/******************************************************************************/
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Matrix.prototype.copyRules = function(other, srcHostname, desHostnames) {
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var thisRules = this.rules;
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var otherRules = other.rules;
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var ruleKey, ruleValue;
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// Specific types
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ruleValue = otherRules['* *'] || 0;
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if ( ruleValue !== 0 ) {
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thisRules['* *'] = ruleValue;
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} else {
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delete thisRules['* *'];
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}
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ruleKey = srcHostname + ' *';
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ruleValue = otherRules[ruleKey] || 0;
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if ( ruleValue !== 0 ) {
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thisRules[ruleKey] = ruleValue;
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} else {
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delete thisRules[ruleKey];
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}
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// Specific destinations
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for ( var desHostname in desHostnames ) {
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if ( desHostnames.hasOwnProperty(desHostname) === false ) {
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continue;
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}
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ruleKey = '* ' + desHostname;
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ruleValue = otherRules[ruleKey] || 0;
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if ( ruleValue !== 0 ) {
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thisRules[ruleKey] = ruleValue;
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} else {
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delete thisRules[ruleKey];
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}
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ruleKey = srcHostname + ' ' + desHostname ;
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ruleValue = otherRules[ruleKey] || 0;
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if ( ruleValue !== 0 ) {
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thisRules[ruleKey] = ruleValue;
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} else {
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delete thisRules[ruleKey];
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}
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}
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return true;
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};
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/******************************************************************************/
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// - * * type
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// - from * type
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// - * to *
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// - from to *
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Matrix.prototype.hasSameRules = function(other, srcHostname, desHostnames) {
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var thisRules = this.rules;
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var otherRules = other.rules;
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var ruleKey;
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// Specific types
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ruleKey = '* *';
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if ( (thisRules[ruleKey] || 0) !== (otherRules[ruleKey] || 0) ) {
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return false;
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}
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ruleKey = srcHostname + ' *';
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if ( (thisRules[ruleKey] || 0) !== (otherRules[ruleKey] || 0) ) {
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return false;
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}
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// Specific destinations
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for ( var desHostname in desHostnames ) {
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ruleKey = '* ' + desHostname;
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if ( (thisRules[ruleKey] || 0) !== (otherRules[ruleKey] || 0) ) {
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return false;
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}
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ruleKey = srcHostname + ' ' + desHostname ;
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if ( (thisRules[ruleKey] || 0) !== (otherRules[ruleKey] || 0) ) {
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return false;
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}
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}
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return true;
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};
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/******************************************************************************/
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Matrix.prototype.setCell = function(srcHostname, desHostname, type, state) {
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var bitOffset = typeBitOffsets[type];
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var k = srcHostname + ' ' + desHostname;
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var oldBitmap = this.rules[k];
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if ( oldBitmap === undefined ) {
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oldBitmap = 0;
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}
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var newBitmap = oldBitmap & ~(3 << bitOffset) | (state << bitOffset);
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if ( newBitmap === oldBitmap ) {
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return false;
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}
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if ( newBitmap === 0 ) {
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delete this.rules[k];
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} else {
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this.rules[k] = newBitmap;
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}
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return true;
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};
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/******************************************************************************/
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Matrix.prototype.unsetCell = function(srcHostname, desHostname, type) {
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this.evaluateCellZY(srcHostname, desHostname, type);
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if ( this.r === 0 ) {
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return false;
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}
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this.setCell(srcHostname, desHostname, type, 0);
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return true;
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};
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// https://www.youtube.com/watch?v=Csewb_eIStY
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/******************************************************************************/
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Matrix.prototype.evaluateCell = function(srcHostname, desHostname, type) {
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var key = srcHostname + ' ' + desHostname;
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var bitmap = this.rules[key];
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if ( bitmap === undefined ) {
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return 0;
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}
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return bitmap >> typeBitOffsets[type] & 3;
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};
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/******************************************************************************/
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Matrix.prototype.clearRegisters = function() {
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this.r = 0;
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this.type = this.y = this.z = '';
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return this;
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};
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/******************************************************************************/
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var is3rdParty = function(srcHostname, desHostname) {
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// If at least one is party-less, the relation can't be labelled
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// "3rd-party"
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if ( desHostname === '*' || srcHostname === '*' || srcHostname === '' ) {
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return false;
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}
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// No domain can very well occurs, for examples:
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// - localhost
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// - file-scheme
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// etc.
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var srcDomain = domainFromHostname(srcHostname) || srcHostname;
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if ( desHostname.endsWith(srcDomain) === false ) {
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return true;
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}
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// Do not confuse 'example.com' with 'anotherexample.com'
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return desHostname.length !== srcDomain.length &&
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desHostname.charAt(desHostname.length - srcDomain.length - 1) !== '.';
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};
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var domainFromHostname = µBlock.URI.domainFromHostname;
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/******************************************************************************/
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Matrix.prototype.evaluateCellZ = function(srcHostname, desHostname, type, broadener) {
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this.type = type;
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var bitOffset = typeBitOffsets[type];
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var s = srcHostname;
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var v;
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for (;;) {
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this.z = s;
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v = this.rules[s + ' ' + desHostname];
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if ( v !== undefined ) {
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v = v >>> bitOffset & 3;
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if ( v !== 0 ) {
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this.r = v;
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return v;
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}
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}
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s = broadener(s);
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if ( s === '' ) { break; }
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}
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// srcHostname is '*' at this point
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this.r = 0;
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return 0;
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};
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/******************************************************************************/
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Matrix.prototype.evaluateCellZY = function(srcHostname, desHostname, type) {
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// Pathological cases.
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var d = desHostname;
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if ( d === '' ) {
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this.r = 0;
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return 0;
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}
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// Prepare broadening handlers -- depends on whether we are dealing with
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// a hostname or IP address.
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var broadenSource = selectHostnameBroadener(srcHostname),
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broadenDestination = selectHostnameBroadener(desHostname);
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// Precedence: from most specific to least specific
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// Specific-destination, any party, any type
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while ( d !== '*' ) {
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this.y = d;
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if ( this.evaluateCellZ(srcHostname, d, '*', broadenSource) !== 0 ) {
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return this.r;
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}
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d = broadenDestination(d);
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}
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var thirdParty = is3rdParty(srcHostname, desHostname);
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// Any destination
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this.y = '*';
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// Specific party
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if ( thirdParty ) {
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// 3rd-party, specific type
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if ( type === 'script' ) {
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if ( this.evaluateCellZ(srcHostname, '*', '3p-script', broadenSource) !== 0 ) {
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return this.r;
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}
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} else if ( type === 'sub_frame' ) {
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if ( this.evaluateCellZ(srcHostname, '*', '3p-frame', broadenSource) !== 0 ) {
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return this.r;
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}
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}
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// 3rd-party, any type
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if ( this.evaluateCellZ(srcHostname, '*', '3p', broadenSource) !== 0 ) {
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return this.r;
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}
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} else if ( type === 'script' ) {
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// 1st party, specific type
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if ( this.evaluateCellZ(srcHostname, '*', '1p-script', broadenSource) !== 0 ) {
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return this.r;
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}
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}
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// Any destination, any party, specific type
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if ( supportedDynamicTypes.hasOwnProperty(type) ) {
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if ( this.evaluateCellZ(srcHostname, '*', type, broadenSource) !== 0 ) {
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return this.r;
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}
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}
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// Any destination, any party, any type
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if ( this.evaluateCellZ(srcHostname, '*', '*', broadenSource) !== 0 ) {
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return this.r;
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}
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this.type = '';
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return 0;
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};
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// http://youtu.be/gSGk1bQ9rcU?t=25m6s
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/******************************************************************************/
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Matrix.prototype.mustAllowCellZY = function(srcHostname, desHostname, type) {
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return this.evaluateCellZY(srcHostname, desHostname, type) === 2;
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};
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/******************************************************************************/
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Matrix.prototype.mustBlockOrAllow = function() {
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return this.r === 1 || this.r === 2;
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};
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/******************************************************************************/
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Matrix.prototype.mustBlock = function() {
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return this.r === 1;
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};
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/******************************************************************************/
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Matrix.prototype.mustAbort = function() {
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return this.r === 3;
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};
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/******************************************************************************/
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Matrix.prototype.lookupRuleData = function(src, des, type) {
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var r = this.evaluateCellZY(src, des, type);
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if ( r === 0 ) {
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return null;
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}
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return {
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src: this.z,
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des: this.y,
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type: this.type,
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action: r === 1 ? 'block' : (r === 2 ? 'allow' : 'noop')
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};
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};
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/******************************************************************************/
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Matrix.prototype.toLogData = function() {
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if ( this.r === 0 || this.type === '' ) {
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return;
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}
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var logData = {
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source: 'dynamicHost',
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result: this.r,
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raw: this.z + ' ' +
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this.y + ' ' +
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this.type + ' ' +
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this.intToActionMap.get(this.r)
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};
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return logData;
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};
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Matrix.prototype.intToActionMap = new Map([
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[ 1, ' block' ],
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[ 2, ' allow' ],
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[ 3, ' noop' ]
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]);
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/******************************************************************************/
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Matrix.prototype.srcHostnameFromRule = function(rule) {
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return rule.slice(0, rule.indexOf(' '));
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};
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/******************************************************************************/
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Matrix.prototype.desHostnameFromRule = function(rule) {
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return rule.slice(rule.indexOf(' ') + 1);
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};
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/******************************************************************************/
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Matrix.prototype.toString = function() {
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var out = [],
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rule, type, val,
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srcHostname, desHostname,
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toUnicode = punycode.toUnicode;
|
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for ( rule in this.rules ) {
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if ( this.rules.hasOwnProperty(rule) === false ) {
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continue;
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}
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srcHostname = this.srcHostnameFromRule(rule);
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desHostname = this.desHostnameFromRule(rule);
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for ( type in typeBitOffsets ) {
|
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if ( typeBitOffsets.hasOwnProperty(type) === false ) {
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continue;
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}
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val = this.evaluateCell(srcHostname, desHostname, type);
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if ( val === 0 ) { continue; }
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if ( srcHostname.indexOf('xn--') !== -1 ) {
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srcHostname = toUnicode(srcHostname);
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}
|
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if ( desHostname.indexOf('xn--') !== -1 ) {
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desHostname = toUnicode(desHostname);
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}
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out.push(
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srcHostname + ' ' +
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desHostname + ' ' +
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type + ' ' +
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actionToNameMap[val]
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);
|
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}
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}
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return out.join('\n');
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};
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|
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/******************************************************************************/
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|
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Matrix.prototype.fromString = function(text, append) {
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var lineIter = new µBlock.LineIterator(text),
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line, pos, fields,
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srcHostname, desHostname, type, action,
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reNotASCII = /[^\x20-\x7F]/,
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toASCII = punycode.toASCII;
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|
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if ( append !== true ) {
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this.reset();
|
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}
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|
|
|
while ( lineIter.eot() === false ) {
|
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line = lineIter.next().trim();
|
|
pos = line.indexOf('# ');
|
|
if ( pos !== -1 ) {
|
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line = line.slice(0, pos).trim();
|
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}
|
|
if ( line === '' ) {
|
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continue;
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}
|
|
|
|
// URL net filtering rules
|
|
if ( line.indexOf('://') !== -1 ) {
|
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continue;
|
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}
|
|
|
|
// Valid rule syntax:
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|
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// srcHostname desHostname type state
|
|
// type = a valid request type
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// state = [`block`, `allow`, `noop`]
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|
|
// Lines with invalid syntax silently ignored
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|
|
|
fields = line.split(/\s+/);
|
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if ( fields.length !== 4 ) {
|
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continue;
|
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}
|
|
|
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// Ignore special rules:
|
|
// hostname-based switch rules
|
|
if ( fields[0].endsWith(':') ) {
|
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continue;
|
|
}
|
|
|
|
// Performance: avoid punycoding if hostnames are made only of
|
|
// ASCII characters.
|
|
srcHostname = fields[0];
|
|
if ( reNotASCII.test(srcHostname) ) {
|
|
srcHostname = toASCII(srcHostname);
|
|
}
|
|
desHostname = fields[1];
|
|
if ( reNotASCII.test(desHostname) ) {
|
|
desHostname = toASCII(desHostname);
|
|
}
|
|
|
|
// https://github.com/chrisaljoudi/uBlock/issues/1082
|
|
// Discard rules with invalid hostnames
|
|
if ( (srcHostname !== '*' && reBadHostname.test(srcHostname)) ||
|
|
(desHostname !== '*' && reBadHostname.test(desHostname))
|
|
) {
|
|
continue;
|
|
}
|
|
|
|
type = fields[2];
|
|
if ( typeBitOffsets.hasOwnProperty(type) === false ) {
|
|
continue;
|
|
}
|
|
|
|
// https://github.com/chrisaljoudi/uBlock/issues/840
|
|
// Discard invalid rules
|
|
if ( desHostname !== '*' && type !== '*' ) {
|
|
continue;
|
|
}
|
|
|
|
action = nameToActionMap[fields[3]];
|
|
if ( typeof action !== 'number' || action < 0 || action > 3 ) {
|
|
continue;
|
|
}
|
|
|
|
this.setCell(srcHostname, desHostname, type, action);
|
|
}
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
Matrix.prototype.toSelfie = function() {
|
|
return {
|
|
magicId: magicId,
|
|
rules: this.rules
|
|
};
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
Matrix.prototype.fromSelfie = function(selfie) {
|
|
this.rules = selfie.rules;
|
|
};
|
|
|
|
/******************************************************************************/
|
|
|
|
return Matrix;
|
|
|
|
/******************************************************************************/
|
|
|
|
// http://youtu.be/5-K8R1hDG9E?t=31m1s
|
|
|
|
})();
|
|
|
|
/******************************************************************************/
|
|
|
|
µBlock.sessionFirewall = new µBlock.Firewall();
|
|
µBlock.permanentFirewall = new µBlock.Firewall();
|
|
|
|
/******************************************************************************/
|